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Wyświetlanie 1-10 z 131
Tytuł:
Investigation and vizualization of the cells grown on ceramic coating by electron microscopy techniques
Autorzy:
Karbowniczek, J.
Gruszczyński, A.
Kruk, A
Czyrska-Filemonowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/285222.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biocompatibility
biomaterials
scanning electron microscopy
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 37
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of scanning electron microscopy for the study of Hoplopleura (Phthiraptera, Anoplura) lice taxonomy
Autorzy:
Kozina, P.
Izdebska, J.N.
Mierzynski, L.
Powiązania:
https://bibliotekanauki.pl/articles/5924.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
scanning electron microscopy
Hoplopleura
Phthiraptera
Anoplura
taxonomy
Źródło:
Annals of Parasitology; 2016, 62, Suppl.
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prospective observational study of adenoidal biofilms in a paediatric population and its clinical implications
Autorzy:
Subtil, Joao
Bajanca-Lavado, Maria Paula
Rodrigues, Joao
Duarte, Aida
Reis, Lucia
Nogueira, Isabel
Jordao, Luisa
Powiązania:
https://bibliotekanauki.pl/articles/1397787.pdf
Data publikacji:
2019
Wydawca:
Index Copernicus International
Tematy:
Adenoids
biofilms
scanning electron microscopy
Haemophilus
child.
Opis:
INTRODUCTION: Adenoids are nasopharyngeal lymphoid tissue with a relevant role in host defence against infection of upper respiratory tract. Nevertheless, adenoids are also a reservoir of microorganisms that can cause infections of upper respiratory tract and otitis particularly in children. OBJECTIVE: Evaluate and compare the association between biofilm assembly on adenoids and the incidence of recurrent infections in a paediatric population submitted to adenoidectomy by either infectious or non-infectious indication. METHODS: Scanning electron microscopy was used to assess biofilms on adenoid surface; biofilm assembly in vitro was monitored by crystal violet assay; antibiotic susceptibility was assessed following EUCAST guidelines; Hinfluenzae capsular typing was performed by PCR. RESULTS: Biofilms were present in 27.4% of adenoid samples and no statistical difference was found between infectious and non-infectious groups. In vitro, the most clinically relevant bacteria, H.influenzae, S.aureus, S.pyogenes, S.pneumoniae and M.catarrhalis, were mostly moderate biofilm assemblers (71.7%). 55.3% of these bacteria were intermediate/resistant to at least one of the tested antibiotics. No association was found between the ability to assemble biofilms in vitro and the presence of biofilms on adenoids nor antibiotic resistance. All H.influenzae were characterized as non-typeable. CONCLUSION: The presence of biofilms on adenoid surface was independent from clinical sample background. Bacterial ability to assemble biofilms in vitro cannot be used to predict biofilm assembly in vivo. The lack of correlation between biofilm formation and infectious respiratory diseases found contributes to question the relevance of biofilms on the pathogenesis of infectious diseases.
Źródło:
Polish Journal of Otolaryngology; 2019, 73, 1; 22-28
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation Mechanisms and Fracture of Ni-Based Metallic Glasses
Autorzy:
Lesz, S.
Griner, S.
Nowosielski, R.
Powiązania:
https://bibliotekanauki.pl/articles/353790.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metals
transmission electron microscopy
scanning electron microscopy
fracture
shear bands
Opis:
The cracking of materials and fracture surface is of great practical and academic importance. Over the last few years the development of the fractography of crystalline alloys resulted in a useful tool for the prediction or failure analysis. Many attempts have been made to observe cracks using optical microscopy, X-ray topography and transmission electron microscopy (TEM). Of these techniques, the resolution of optical microscopy and X-ray topography is too poor. By contrast, the resolution of TEM is high enough for detailed information to be obtained. However, in order to apply TEM observations, a thin foil specimen must be prepared, and it is usually extremely difficult to prepare such a specimen from a pre-selected region containing a crack. In the present work, deformation mechanisms fracture surfaces of Ni-based metallic glass samples have been studied by specially designed experiments. In order to study the deformation mechanisms and fracture the Ni-based metallic glasses have been investigated in the tensile test. The structure and fracture surfaces after the decohesion process in tensile tests were observed using transmission electron microscope (TEM) and scanning electron microscope (SEM), respectively. The studies of structure were performed on thin foils. Moreover the investigated tape was subjected to a banding test. Then, the tape was straightened and the thin foil from the area of maximum strain was prepared. This thin foil sample was deformed before the TEM investigation to obtain local tears.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 791-796
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diversity of labellar micromorphological structures in selected species of Malaxidinae [Orchidales]
Autorzy:
Kowalkowska, A
Margonska, H.B.
Powiązania:
https://bibliotekanauki.pl/articles/58622.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
light microscopy
scanning electron microscopy
Orchidaceae
micromorphology
Malaxidinae
pollination
Opis:
There are no papers examining the labellar micromorphology in Malaxidinae in detail. The aim of this paper is to present the results of labellar micromorphology of our studies on Malaxidinae. The micromorphology of nine species was examined and described (calli, nectaries, OP structures, concavities). These species are divided into six groups of which the lip morphology probably represents different forms of attracting and rewarding pollinators. Group one consists of Disticholiparis gregaria and Platystyliparis aurita with characteristic globular nectary and pad-like callus. The second group with Liparis nervosa has two conelike convexities. The third one is represented by Liparis sutupensis with spread lip, the basal callus, and the epichile often eroding with age. The fourth group (Stichorkis cespitosum) has a massive hypochil with basal callus and delicate epichil. The fifth group (Microstylis ophioglossoides, Dienia ophrydis) is characterized by a lip with developed lateral lobes, three deep concavities in the middle part, an erect callus, and many raphide cells.Crepidium cf. rheedii and Crepidium dryadum from the sixth group have a three-lobed lip with entire or toothed mid-lobe, basal callus, cavity surrounded by a rim and OP structures with raphide cells. We also emphasized the different way and place of nectar secretion in the subtribe and gave some suggestions about pollination strategies.
Źródło:
Acta Societatis Botanicorum Poloniae; 2009, 78, 2; 141-150
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning electron microscopic picture of the concentration and distribution of protein structures in the seed endosperm of low and high protein varietes of rye (Secale cereale L.)
Badania porównawcze ilości i rozmieszczenia białek w komórkach endospermy ziarniaków nisko- i wysokobiałkowych odmian żyta
Autorzy:
Kubiczek, R.
Luczak, W.
Molski, B.
Moczydłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1399430.pdf
Data publikacji:
1989
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
rye
scanning electron microscopy
endosperm structures
protein structure
Opis:
Comparative studies of subaleurone and inner endosperm cells of dry mature caryopses from 8 low-protein and 7 high-protein varieties of rye, grown in similar conditions of isolated collection, were performed by means of scanning electron microscopy technique. Low protein varieties contained starch granules differentiated in the diameter embedded in the less dense protein matrix of the wide subaluerone region. High protein varieties, besides the larger aleurone cells had in some examples wider subaluerone layer with the dense protein matrix, which was very regular and less packed with starch granules. The inner endosperm cells of high-protein caryopses contained much more dense protein matrix all around the starch granules in contrast to low-protein caryopses, which were tightly packed with starch and had only a thin layer of protein matrix around them. Comparative pronase treatment of low- and high-protein rye caryopses confirmed the above observations. No granular protein bodies in any cells, besides the aleurone ones, could be observed.
Przeprowadzono badania porównawcze ilości i rozmieszczenia składników białkowych komórek warstw podaleuronowych i głębszych warstw endospermy w suchych, dojrzałych ziarniakach 8 niskobiałkowych i 7 wysokobiałkowych odmian żyta (tab.), wyhodowanych w 1974/75 r. w Skierniewicach i 1976/77 r. w Powsinie w identycznych warunkach izolowanej kolekcji zachowawczej z wykorzystaniem skaningowego mikroskopu elektronowego (SEM). W odmianach niskobiałkowych ziarna skrobiowe o zróżnicowanej średnicy były zatopione w grubej warstwie matrycy białkowej w komórkach cienkiej warstwy podaleuronowej (fot. 1, 2, 3). W odmianach wysokobiałkowych, oprócz zdarzających się w wypadku niektórych odmian większych komórek warstwy aleuronowej, warstwa podaleuronowa była lepiej wykształcona z dużą ilością matrycy białkowej i regularnymi i mniej upakowanymi w niej ziarnami skrobi (fot. 4, 5). Również w głębszych warstwach endospermy komórki ziarniaków odmian wysokobiałkowych zawierały więcej matrycy białkowej otaczającej ziarna skrobi w przeciwieństwie do niskobiałkowych, których komórki wypełnione są szczelnie ziarnami skrobi i zawierają niewielkie ilości białek pomiędzy nimi oraz białko cytoplazmatyczne pod ścianami komórek. Porównawcze trawienie pronazą skrawków ziarniaków odmian nisko- i wysokobiałkowych (fot.8) potwierdziło powyższe twierdzenia. Nie zauważono w komórkach innych niż aleuronowe granularnych ciał białkowych w żadnej z badanych odmian żyta.
Źródło:
Acta Alimentaria Polonica; 1989, 15(39), 2; 185-195
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of the El Hammami olivine-bronzite meteorite
Autorzy:
Zarek, W.
Popiel, E.
Tuszyński, M.
Teper, E.
Powiązania:
https://bibliotekanauki.pl/articles/147220.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
meteorite
XRD
scanning electron microscopy
Mössbauer spectroscopy
kamacite
Opis:
The phase composition of the El Hammami meteorite was investigated by X-ray, magnetostatic, Mössbauer effect and environmental scanning electron microscopy methods. Performed investigations indicated that this meteorite consists of aluminosilicates, olivine (Mg,Fe)2SiO4, pyroxene (Ca,Mg,Fe)SiO3, kamacite (bcc Fe-Ni alloy) and troilite (FeS). Some inclusions of Ti and Cr were observed by scanning electron microscopy. The concentration of Ni in kamacite was determined by comparison of the Mössabauer spectra of Fe-Ni phase in the meteorite with those for synthetic bcc Fe-Ni alloys (5, 10, 25% Ni).
Źródło:
Nukleonika; 2004, 49,suppl.3; 59-62
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Quenching Rate on the Structure and Magnetic Properties of the Fe-Based Amorphous Alloy
Autorzy:
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/350944.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transmissions electron microscopy
scanning electron microscopy
amorphous matrials
free volumes
quasidislocation
Opis:
This paper presents the results of investigations into the structure, microstructure and magnetic properties of Fe61Co10Y8W1B20 amorphous alloy. The alloy samples were in two physical forms: (1) plates of approximate thickness 0.5 mm (so-called bulk amorphous alloys) and (2) a ribbon of approximate thickness 35 μm (so-called classic amorphous alloy). The investigations comprised: X-ray diffractometry, Mössbauer spectrometry, transmission electron microscopy, and selected magnetic measurements; all of the investigations were carried out on samples in the as-quenched state. Analysis of the obtained SEM and TEM images, X-ray diffraction patterns, Mössbauer spectrometry results and measurements of the magnetisation in a high magnetic field facilitated collectively the detailed description of the structure of the investigated alloy, which was found to depend on the quenching speed.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 439-444
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Milling Time on Amorphization of Mg-Zn-Ca Powders Synthesized by Mechanical Alloying Technique
Autorzy:
Lesz, S.
Kremzer, M.
Gołombek, K.
Nowosielski, R.
Powiązania:
https://bibliotekanauki.pl/articles/354717.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg-based powders
transmission electron microscopy
scanning electron microscopy
mechanical alloying
Opis:
Mg60 Zn35 Ca5 amorphous powder alloys were synthesized by mechanical alloying (MA) technique. The results of the influence of high-energy ball-milling time on amorphization of the Mg60 Zn35 Ca5 elemental blend (intended for biomedical application) were presented in the study. The amorphization process was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM). Initial elemental powders were mechanically alloyed in a Spex 8000 high-energy ball mill at different milling times (from 3 to 24 h). Observation of the powder morphology after various stages of milling leads to the conclusion that with the increase of the milling time the size of the powder particles as well as the degree of aggregation change. The partially amorphous powders were obtained in the Mg60 Zn35 Ca5 alloy after milling for 13-18h. The results indicate that this technique is a powerful process for preparing Mg60 Zn35 Ca5 alloys with amorphous and nanocrystalline structure.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 845-851
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microscopic analysis of the nanostructures impact on endothelial cells
Autorzy:
Kołodziejczyk, Agnieszka Maria
Kucińska, Magdalena
Jakubowska, Aleksandra
Siatkowska, Małgorzata
Sokołowska, Paulina
Kotarba, Sylwia
Makowski, Krzysztof
Komorowski, Piotr
Walkowiak, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/1844983.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanostructures
atomic force microscopy
transmission electron microscopy
scanning electron microscopy
cell morphology
Opis:
Nowadays nanostructures are more and more often designed as carriers for drug delivery, especially to improve the drug pharmacokinetics and pharmaco-dynamics. Numerous kinds of nanostructures are considered a good prospect for medical applications thanks to their small size, acceptable biocompatibility and toxicity. Due to the fact that nanotechnology is a new field of science, every nano-scale product must be thoroughly examined regarding its toxicity to the human body. This study provides new insights into effects of exposing endothelial cells to the selected nanostructures. Dendrimers of the fourth generation (PAMAMs), multi-walled carbon nanotubes (MWCNTs) and silver nanoparticles (SNPs) were used to evaluate nanostructures influence on endothelial cells in vitro. The nanostructures were evaluated via transmission electron microscopy and dynamic light scattering technique. The cells previously exposed to the nanostructures were observed and analyzed via the atomic force microscopy and scanning electron microscopy to obtain a quantitative evaluation of the cells morphology. The presence of multi-walled carbon nanotubes and silver nanoparticles on the cells surface was confirmed by the scanning electron microscopy. Our results confirm that the surface association and/or uptake of nanostructures by the cells resulting from physicochemical and biological processes, affect the cells morphology. Morphological changes can be induced by the membrane proteins interaction with nanomaterials, which trigger a sequence of intracel-lular biological processes.
Źródło:
Engineering of Biomaterials; 2020, 23, 154; 2-8
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 131

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